/
httpservers.go
256 lines (221 loc) · 7.11 KB
/
httpservers.go
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package web
import (
"context"
"expvar"
"fmt"
"net/http"
"net/http/pprof"
"strings"
"time"
"github.com/ash2k/stager/wait"
"github.com/gorilla/mux"
"github.com/sirupsen/logrus"
"github.com/spf13/viper"
"github.com/atlassian/gostatsd"
"github.com/atlassian/gostatsd/internal/util"
"github.com/atlassian/gostatsd/pkg/healthcheck"
)
type httpServer struct {
logger logrus.FieldLogger
address string
Router *mux.Router // should be private, but project layout is not great.
rawMetricsV2 *rawHttpHandlerV2
}
type route struct {
path string
handler http.HandlerFunc
methods []string
name string
}
var done = struct{}{}
func NewHttpServersFromViper(
v *viper.Viper,
logger logrus.FieldLogger,
handler gostatsd.PipelineHandler,
healthChecks []healthcheck.HealthcheckFunc,
deepChecks []healthcheck.HealthcheckFunc,
) ([]*httpServer, error) {
httpServerNames := v.GetStringSlice("http-servers")
servers := make([]*httpServer, 0, len(httpServerNames))
for _, httpServerName := range httpServerNames {
server, err := newHttpServerFromViper(logger, v, httpServerName, handler, healthChecks, deepChecks)
if err != nil {
return nil, fmt.Errorf("failed to make http-server %s: %v", httpServerName, err)
}
servers = append(servers, server)
}
return servers, nil
}
func newHttpServerFromViper(
logger logrus.FieldLogger,
vMain *viper.Viper,
serverName string,
handler gostatsd.PipelineHandler,
healthChecks []healthcheck.HealthcheckFunc,
deepChecks []healthcheck.HealthcheckFunc,
) (*httpServer, error) {
vSub := util.GetSubViper(vMain, "http."+serverName)
vSub.SetDefault("address", "127.0.0.1:8080")
vSub.SetDefault("enable-prof", false)
vSub.SetDefault("enable-expvar", false)
vSub.SetDefault("enable-ingestion", false)
vSub.SetDefault("enable-healthcheck", true)
return NewHttpServer(
logger.WithField("http-server", serverName),
handler,
serverName,
vSub.GetString("address"),
vSub.GetBool("enable-prof"),
vSub.GetBool("enable-expvar"),
vSub.GetBool("enable-ingestion"),
vSub.GetBool("enable-healthcheck"),
healthChecks,
deepChecks,
)
}
func NewHttpServer(
logger logrus.FieldLogger,
handler gostatsd.PipelineHandler,
serverName, address string,
enableProf,
enableExpVar,
enableIngestion,
enableHealthcheck bool,
healthChecks []healthcheck.HealthcheckFunc,
deepChecks []healthcheck.HealthcheckFunc,
) (*httpServer, error) {
var routes []route
server := &httpServer{
logger: logger,
address: address,
}
if enableProf {
routes = append(routes,
route{path: "/debug/pprof/cmdline", handler: pprof.Cmdline, methods: []string{"GET"}, name: "pprof_cmdline"},
route{path: "/debug/pprof/profile", handler: pprof.Profile, methods: []string{"GET"}, name: "pprof_profile"},
route{path: "/debug/pprof/symbol", handler: pprof.Symbol, methods: []string{"GET"}, name: "pprof_symbol"},
route{path: "/debug/pprof/trace", handler: pprof.Trace, methods: []string{"GET", "POST"}, name: "pprof_trace"},
route{path: "/debug/pprof/{any:.*}", handler: pprof.Index, methods: []string{"GET"}, name: "pprof_index"},
)
}
if enableExpVar {
routes = append(routes,
route{path: "/expvar", handler: expvar.Handler().ServeHTTP, methods: []string{"GET"}, name: "expvar_get"},
)
}
if enableIngestion {
server.rawMetricsV2 = newRawHttpHandlerV2(logger, serverName, handler)
routes = append(routes,
route{path: "/v2/raw", handler: server.rawMetricsV2.MetricHandler, methods: []string{"POST"}, name: "metricsv2_post"},
route{path: "/v2/event", handler: server.rawMetricsV2.EventHandler, methods: []string{"POST"}, name: "eventsv2_post"},
)
}
if enableHealthcheck {
hc := &healthChecker{logger: logger,
healthChecks: healthChecks,
deepChecks: deepChecks,
}
routes = append(routes,
route{path: "/healthcheck", handler: hc.healthCheck, methods: []string{"GET"}, name: "healthcheck_get"},
route{path: "/deepcheck", handler: hc.deepCheck, methods: []string{"GET"}, name: "deepcheck_get"},
)
}
if len(routes) == 0 {
return nil, fmt.Errorf("must enable at least one of prof, expvar, ingestion, or healthcheck")
}
router, err := createRoutes(routes)
router.NotFoundHandler = server.logRequest(http.HandlerFunc(server.notFound))
if err != nil {
return nil, err
}
router.Use(server.logRequest)
server.Router = router
logger.WithFields(logrus.Fields{
"address": address,
"enable-pprof": enableProf,
"enable-expvar": enableExpVar,
"enable-ingestion": enableIngestion,
"enable-healthcheck": enableHealthcheck,
}).Info("Created server")
return server, nil
}
func (hs *httpServer) notFound(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(404)
_, _ = w.Write([]byte("not found"))
}
func createRoutes(routes []route) (*mux.Router, error) {
router := mux.NewRouter()
for _, route := range routes {
r := router.HandleFunc(route.path, route.handler).Methods(route.methods...).Name(route.name)
if err := r.GetError(); err != nil {
return nil, fmt.Errorf("error creating route %s: %v", route.name, err)
}
}
return router, nil
}
func (hs *httpServer) logRequest(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
var routeName string
route := mux.CurrentRoute(req)
logFields := logrus.Fields{
"route": routeName,
"srcip": strings.Split(req.RemoteAddr, ":")[0],
"path": req.URL.Path,
}
if route == nil {
logFields["path"] = req.URL.Path
logFields["method"] = req.Method
} else {
logFields["route"] = route.GetName()
}
source := req.Header.Get("X-Forwarded-For")
if source != "" {
logFields["forwarded_for"] = source
}
start := time.Now()
handler.ServeHTTP(w, req)
dur := time.Since(start)
logFields["duration"] = float64(dur) / float64(time.Millisecond)
hs.logger.WithFields(logFields).Debug("request")
})
}
func (hs *httpServer) Run(ctx context.Context) {
if hs.rawMetricsV2 != nil {
var wg wait.Group
defer wg.Wait()
wg.StartWithContext(ctx, hs.rawMetricsV2.RunMetricsContext)
}
server := &http.Server{
Addr: hs.address,
Handler: hs.Router,
}
chStopped := make(chan struct{}, 1)
go hs.waitAndStop(ctx, server, chStopped)
hs.logger.WithField("address", server.Addr).Info("listening")
err := server.ListenAndServe()
if err != http.ErrServerClosed {
hs.logger.WithError(err).Error("web server failed")
return
}
// Wait for graceful shutdown of existing connections
select {
case <-chStopped:
// happy
case <-time.After(6 * time.Second):
hs.logger.Info("timeout waiting for webserver to stop")
}
}
// waitAndStop will gracefully shut down the Server when the Context passed is cancelled. It signals
// on chStopped when it is done. There is no guarantee that it will actually signal, if the server
// does not shutdown.
func (hs *httpServer) waitAndStop(ctx context.Context, server *http.Server, chStopped chan<- struct{}) {
<-ctx.Done()
hs.logger.Info("shutting down web server")
timeoutCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
err := server.Shutdown(timeoutCtx)
if err != nil {
hs.logger.WithError(err).Warn("failed to stop web server")
}
chStopped <- done
}